A Veiled Chameleon will live approximately 5 years in captivity, possibly 8 years for males. Adult males can reach 18-24 inches in total length (about 12 inches snout to vent length), while females tend to be quite a bit smaller at 10-13 inches (just 4-6 inches in snout to vent length).
Habitat
A very tall enclosure is recommended, 36-48″ tall, by 36″ by 24″ (the bigger and taller the better, as chameleons like to climb high up off the ground). Potted plants can be placed on a plain paper substrate for easier cleaning while still allowing live planting in the cage. Recommended plants include: Ficus tree, pothos, umbrella schefflera, money tree. A consistent temperature of 80-90° F should be provided, with a basking spot at 95° F. At night, they should have a temperature drop of about 10-15° F. Providing an ultraviolet (UV A/UVB) light source is important, so invest in a good bulb such as the Zoomed’s Reptisun 5.0. Keep the UV light on for 10-12 hours per day. Maintain a moderate humidity level, 50%. Misting the plants twice daily will help with humidity levels, and a drip or misting system is also recommended.
Diet
Crickets are the main diet of veiled chameleons. They can be dusted with a calcium/vitamin D3 supplement for healthier animals.
Source: https://www.reptilesmagazine.com/Care-Sheets/Lizards/Veiled-Chameleon/